21613986693 has 48 divisors (see below), whose sum is σ = 35735306880. Its totient is φ = 12478396032.

The previous prime is 21613986649. The next prime is 21613986703. The reversal of 21613986693 is 39668931612.

21613986693 is a `hidden beast` number, since 2 + 161 + 398 + 6 + 6 + 93 = 666.

It is not a de Polignac number, because 21613986693 - 2⁶ = 21613986629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613986623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 181771 + ... + 276167.

It is an arithmetic number, because the mean of its divisors is an integer number (744485560).

Almost surely, 2^21613986693 is an apocalyptic number.

It is an amenable number.

21613986693 is a deficient number, since it is larger than the sum of its proper divisors (14121320187).

21613986693 is a wasteful number, since it uses less digits than its factorization.

21613986693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94538 (or 94535 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The spelling of 21613986693 in words is "twenty-one billion, six hundred thirteen million, nine hundred eighty-six thousand, six hundred ninety-three".